Datasheet

11
LT1002
1002fb
APPLICATIONS INFORMATION
WUU
U
Precision ±10V Reference
3
LM129A
4
10
11
13
14
1k
12
6
7
5
1002 TA08
10k
0.1%
3.3k
1%
0.1%
10k
–
+
OUT 2
–10.000V
–15V
15V
OUT 1
10.000V
1/2
LT1002
–
+
1/2
LT1002
130k
5%
8.2k
1%
3.3k
1%
When the upper or lower limit is exceeded the LED lights
up. Positive feedback to one of the nulling terminals
creates 5 to 20µV of hysteresis on both amplifiers. This
feedback changes the offset voltage of the LT1002 by less
than 5µV. Therefore, the basic accuracy of the comparator
is limited only by the low offset voltage of the LT1002.
Dual Limit Microvolt Comparator
4
10
3
11
13
12
5
1
14
6
8
7
UPPER
LIMIT
INPUT
LOWER
LIMIT
1002 TA09
430k
1%
20k
5%
–15V
–15V
15V
FLV117
39.2Ω
1%
15k
1%
39.2Ω
1%
15k
1%
1k
5%
–
+
–
+
1/2
LT1002
1/2
LT1002
1/4 CA3118
430k
1%
1/4 CA3118
1/4 CA3118
1/4 CA3118
The LT1002 contributes less than 5% of the total drift with
temperature, noise and long term drift of the reference.
The accuracy of the –10V output is limited by the matching
of the two 10k resistors.